drm/i915: Remove i915_reg.h from g4x_dp.c
Move DE_IRQ_REGS to display header to make g4x_dp.c
free from i915_reg.h dependency. These registers are
only used by display and gvt.
v3: Drop a superfluous include (Jani)
v2: Move DE interrupt regs from common to display header (Jani)
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patch.msgid.link/20260205094341.1882816-12-uma.shankar@intel.com